Once an account is set up on a switch your kids will not need to remember password to access it. From what I recall the only time you might have to recall the password is to add funds to the account to buy games on the shop.
There is a companion parental control app that allows you limit screen time or access hours and filter games by age rating. You’ll still have full access to the console through a quick passcode.
Disclaimer: I don’t use News+. This is just what I think I remember from some podcast episode a while ago.
IIrc: it only does this for the Top Stories feed which is a handful of stories handpicked by Apple. It would be weird if your Top Stories was super short or completely blank because you happened to block all the right sources. Your regular feed should be filtered.